Download Arthropods of Mediterranean-Type Ecosystems by George P. Stamou PDF

By George P. Stamou

G.P. Stamou describes the adaptive concepts that permit arthropods to deal with the severity of Mediterranean environments. After an advent to the constitution and serve as of Mediterranean-type ecosystems, ecophysiological variations to water rigidity and ranging temperature are thought of. extra, job styles and lifestyles cycle strategies are mentioned when it comes to the peculiarity of Mediterranean environments. Phenological styles and inhabitants dynamics in addition to neighborhood buildings also are provided. the quantity ends with a synthesis of existence heritage tactics.

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The notable excep- The Joint Effect of Temperature and Humidity on Feeding Activity and Demography 53 tion is the assimilation coefficient recorded in G. balcanica which is higher than that estimated for desert (Wooten and Crawford 1975) or temperate counterparts (Mason 1970). Unfortunately, no relevant data for other Mediterranean arthropods exist, but it may generally hold true that low maintenance cost of arthropods is coupled with efficient exploitation of food resources. 3 Long-Term Effect ofTemperature The long-term effect of temperature is mainly impressed on demographic parameters.

For example, Karamaouna and Geoffroy (1985) reported that surface activity of five diplopod species in an insular Mediterranean formation was confined to the wet period from November to April. Analogous observations were also reported by Baker (1979a) for the millipede Ommatoiulus moreletii, in which activity peaks were recorded during the breeding period in autumn/early winter. In summer, most animals displayed little activity - due to their high moisture and moderate temperature preferences - and formed aggregations in favourable microsites (Baker 1980).

Arrows indicate cessation of feeding activity... Ecdysis; a 10 s after ecdysis; b 30 min after ecdysis; c 60 min after ecdysis (Verhoef 1981) moisture - haemolymph osmolality decreases, since a major water source is food. Locomotory activity persists even in progressively desiccating substrates and, after deprivation of nutritional water, the animals consume their own reserves and finally die. Recovery of the population is ensured by a few individuals surviving in favourable microsites. Fluctuations in blood osmolality during the development of an ins tar have been observed by Verhoef (1981; Fig.

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